Foggy day

It is necessary to seperate the use of 'getSupportFragmentManager()' and 'getChildFragmentManager()'. If you have Activity "A" and Fragment "A-1" in "A", you should use getSupportFragmentManager() when you manage "A-1". getSupportFragmentManager() need activity. But If you have Fragment "B", "C" in "A-1", you shoud use getChildFragmentManager() when you manage "B", "C". If you work in fragment "..